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challenge

A challenge is a demand for proof or an invitation to participate in a competition. (noun)

  1. An example of challenge is a guard asking for identification.
  2. An example of challenge is a boxer asking another boxer to take part in a boxing match.

A challenge is an act of rebellion against someone or something. (noun)

An example of challenge is an employee questioning the actions of their supervisor in a meeting.

Challenge means to stop someone and ask for their identification. (verb)

An example of challenge is someone being stopped at a border crossing to show their passport.

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See challenge in Webster's New World College Dictionary

See challenge in American Heritage Dictionary 4

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